It’s the same approach Middleton used to regain her fit bikini body after giving birth to her first child. In 2014, Kate lost 29 pounds less than 2 months after giving birth to son George with a low carb diet.

Kate Middleton lost 29 pounds less than 2 months after her pregnancies with a low-carb diet. (Kensington Palace/Instagram)

Low carb, high-fat diets such as the Atkins and ketogenic diets fuel rapid weight loss by inducing the body to burn fat for fuel, said obesity expert Dr. Mark Hyman, author of Eat Fat, Get Thin.

The Duchess has been nicknamed “the Smoothie Queen” because she loves to use her Nutribullet blender at home to make her own healthy fruit and vegetable drinks. Daily juicing also keeps Kate’s skin radiant and wrinkle-free.

Middleton, a star college athlete, works out almost every day, combining cardio exercise, yoga and weightlifting. Kate is also an expert skier and tennis player.